Czech Journal of Food Sciences, 2003 (vol. 21), issue 2
Effect of lactic acid on the growth dynamics of Candida maltosa YP1
D. Lauková, Ľ. Valík, F. Görner
Czech J. Food Sci., 2003, 21(2):43-49 | DOI: 10.17221/3476-CJFS 
The growth dynamics of the oxidative imperfect yeast strain Candida maltosa YP1 isolated from the surface of fruit yoghurt was studied in relation to the lactic acid concentration ranging from 0 to 1.6% (w/v). The maximal specific growth rate of 0.36 h-1 and minimal lag-phase duration of 2.9 h were found in the glucose solution without lactic acid at 25°C. The decrease of the natural logarithm of both the specific growth rate (ln µ) and the lag-phase prolongation (ln ) in the dependence on the increase of lactic acid concentration (0-1.59%) was significantly linear (ln µ = -1.1458 - 0.6056 c; R2(µ)...
Relation between free amino acids and the biogenic amines contents in green tomatoes inoculated with Lactobacillus plantarum
M. Veselá, M. Drdák, S. Standara
Czech J. Food Sci., 2003, 21(2):51-58 | DOI: 10.17221/3477-CJFS
The aim of the work presented here was the evaluation of the profile of free amino acids as the possible precursors of biogenic amines (BAs) in tomatoes and its changes during tomato ripening. Hygienically significant amounts of BAs can be formed by the action of amino acid decarboxylases provided the tomatoes contain a high enough amount of free amino acids. In view of this, the effect was studied of Lactobacillus plantarum strains 976H and 3626 on the BAs formation in green tomatoes. Homogenates of green tomatoes were adjusted to the model conditions of conservation by the addition of NaCl to the concentration of 1.5% (w/w) and of glucose...
Extention of the spectra of plant products for the diet in coeliac disease
J. Petr, I. Michalík, H. Tlaskalová, I. Capouchová, O. Faměra, D. Urminská, L. Tučková, H. Knoblochová
Czech J. Food Sci., 2003, 21(2):59-70 | DOI: 10.17221/3478-CJFS
The authors studied an extension of the sources of plant products for the diet in coeliac disease. This disease is induced by the components of glutenin proteins. In a collection of crops, they examined the contents of the total and protein nitrogen, the composition of protein fractions, the electrophoretic composition of reserve gluten and prolamine proteins, and the immunological determination of the gliadin amount using ELISA test. By immunological tests, gliadin content below 10 mg per 100 g of sample was found in the following species: amaranth (Amaranthus hypochondriacus and A. cruentus) followed by quinoa (Chenopodium quinoa),...
Use of maturograph and spring oven for the dermination of wheat flour baking characteristics
M. Hrušková, J. Skvrnová
Czech J. Food Sci., 2003, 21(2):71-77 | DOI: 10.17221/3479-CJFS
Quality characteristics of 30 commercial wheat flour samples from Czech industrial mills and 30 wheat flour samples prepared from wheat varieties cultivated in experimental fields (all from wheat harvest 2000) were analysed in detail including maturograph and spring oven (both from Brabender, Germany) as well as bread baking test (Czech method). Specific bread volumes of all flour samples were compared with the bread volumes determined by the oven spring test. The correlation analysis which expressed the relations between wheat flour rheological characteristics and the bread volume is reported. The maturograph parameters correlate significantly with...
Comparison of antioxidative activity data for aqueous extracts of lemon balm (Melissa officinalis L.), oregano (Origanum vulgare L.), thyme (Thymus vulgaris L.), and agrimony (Agrimonia eupatoria L.) obtained by conventional methods and the DNA-based biosensor
Ľ. Heilerová, M. Bučková, P. Tarapčík, S. Šilhár, J. Labuda
Czech J. Food Sci., 2003, 21(2):78-84 | DOI: 10.17221/3480-CJFS
The antioxidative properties of aqueous plant extracts were evaluated using common methods such as the Rancimat and 2,2'-diphenyl-1-picrylhydrazyl (DPPH) free radical method. Moreover, a voltammetric procedure based on the protective effect of antioxidants against the oxidative DNA damage was employed using a disposable DNA biosensor fabricated as a screen-printed electrode chemically modified by calf thymus double stranded (ds) DNA. The total polyphenols were also determined spectrophotometrically with the Folin-Ciocalteu agent. The extracts of oregano and lemon balm exhibited significantly higher activity than those of thyme and agrimony. The results...